Fix sliders for whole numbers

[PabstMirror]

[3.14, 1, -2] call cba_fnc_formatNumber = "003"
Could also fix in formatNumber?
Or we could switch to toFixed (3.14 toFixed -1 = "3")

[commy2]

-2 meaning 3 forced digits with leading zeros is intended by CBA_fnc_format.
Why does the setting use _trailingDecimals = -2 in the first place?

[PabstMirror]

From #510

FormatNumber:

_decimalPlaces - Number of decimal places, padded with trailing 0s,
        if necessary [Number: >= 0, defaults to 0]

I guess the call would be [3.14, 1, -1] call cba_fnc_formatNumber but that's also "003"

[commy2]

Is the -1 supposed to be "ignore this"?

[3.14, 1, -1] call cba_fnc_formatNumber [is] also "003"

That's a bug then.

[PabstMirror]

-1 is for whole numbers only,
but passing -1 to format number is undefined, not really an error

I think we should just do the _trailingDecimals max 0 as that fixes the output

[commy2]

-1 is for whole numbers only,

But that is already what 0 does. Zero places after the decimal dot.

[PabstMirror]

See #510
0 doesn't display decimal places, but they still exist in the final setting.

[commy2]

I get it now.